Question

the best method to measured the power in three phases balanced circuit is
a) tow wattmeter method
b) three wattmeter method
c) one wattmeter method
d) all of the above​

Answer 1

The best method to measure the power in three phases balanced circuit is the one-wattmeter method. Thus option C is correct.

How one-wattmeter method is used to measure the power?

• The one-wattmeter method is used for delta and star-connected loads.  
• While the two-wattmeter and three-wattmeter methods are used for both (balanced and unbalanced methods).

Thus, option C is the right answer.